140 ONTOLOGY. 



crystallization from taking place upon a large scale ; they 

 moreover mingled with the mechanically water-borne and 

 crumbling debris of the earlier species of rocks ; their 

 laminations therefore resemble rather a mechanical depo- 

 sit from water. They are the Stratified rocks. 



635. As the first period must include the calcareous 

 earth, so also in the period of strata or in the dualized 

 period this earth is not without a slight antagonism of 

 the fundamental earths ; and this it is which for the first 

 time becomes distinct, but always with a preponderance 

 of the calcareous over the fundamental earths, while in 

 the primary periods this relative proportion of the two 

 was the reverse. 



636. The primary period repeats itself again in the 

 second, and thus strata consisting of the fundamental 

 earths originate, as we have seen exemplified in the pri- 

 mary and transition formations of limestone. The pre- 

 cipitation of strata is divided also into four formations, 

 into silicious, argillaceous, talcose and calcareous strata, 

 close to which range also the strata of ores, Inflammables 

 and salts. 



637. In other respects the chemical deposits of this 

 period are so blended with the mechanical, that then- 

 mode of origin seems for the most part to have happened 

 in both ways. 



638. The silicious formation returning in the stratified 

 periods is chiefly under the condition of sandstone. 

 Apart from that, which has originated through the detri- 

 tus of the older kinds of rocks, it may be assumed, that 

 the prevailing lime still held some silicious earth in a 

 state of moisture within itself, and that this during its 

 separation was precipitated as a fine alcohol, namely, as 

 sand. If, however, sand fell, so also must a propor- 

 tionate quantity of lime fall, by combining itself with an 

 acid. Sand and lime therefore usually accompany each 

 other. If the two be regarded also as only floated freely 

 and suspended in water, still the chemical antagonism 

 manifests itself between them as if they were in a mortar, 

 and they have been precipitated in layers alternating with 



